If a triangle has two equal sides, it is called isosceles (pronounced eye-SOS-a-lees). “Iso” means “same” and “sceles” is related to “scale.” Decide whether each triangle formed by the points below is isosceles. Explain how you decided.
, , , , , , , ,
The triangles described in parts (a), (b) and (d) are isosceles because there is one pair of equal sides.
Use the eTool below to graph the points and view the triangles.
Click the link at right for the full version of the eTool: 1-95 HW eTool (Desmos)